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MultiPlay QoS / QoE test & monitoring

Introduction to:Integrated Multimedia Test System (IMTS)Enhanced TV Monitoring System (ETVMS)

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2 4

7The Triple Play Challenge

Triple play is a business concept; a bundle of services rather than a completely new development.

1. Triple play is not a new technology, but a marketing concept for delivering three services: broadband access, television and telephone services over a single access network.

2. If mobile services are included, the bundle is often referred to as Quadruple Play.

3. There are two concepts closely related to triple-play:

- Service bundling: all the services are bundled into a commercial product.

- Technological convergence: one network supports voice/data/video applications.

4. Triple play can be delivered over various network types - copper, fibre, coaxial and wireless.

5. Inter-operability is not a requirement, but IP is at the heart of every implementation.

VoIPIPTV Internet VPNVoD Mobile Gaming

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7Triple Play business: provider view

Telecom operators are embracing a new strategy to deliver new, thrilling services by means of next generation networks. This packet of services includes line rental and fixed telephony with a combination of Internet access, IP television, video-on-demand, entertainment applications and, eventually, cellular phone services.

Network Convergence

- IP-centric- Packet-oriented- QoS-enabled- Multiservice- Multiterminal

Multiple Services

- Internet access- Telephony / Video calls - Television- Video-on-Demand- Mobile bundling

IP

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7Network Convergence and Device Diversity

Triple Play is not only a set of multiple information flows, but it is a way to make a wide range of devices and terminals manage data, audio and video applications.

Laptop MP3/4 TV MobileHand-held

Internet TV Music Games VoIP VoD

PDA

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7The Business Challenge for Service Providers

Cable OperatorTelecom Operator

DOCSIS

TV

VoIP

Internet Provider

DSL

TV

DSL (and Fibre)

DSL

VoIPIPTV

IPTV

Mobile Operator

GPRS

3G

GSMPCM

VoIP

VoiceData

Video

VoiceData

AnyIMSHFC

Network Convergence

FDM

Threats

- Voice revenue drop- Attacked by ISP in VoIP- LLU (Local Loop Unbundling)- High churn

Opportunities

- Triple Play

Threats

- Telcos video entry- Access restriction

Opportunities

- Two-way upgrading

Threats

- ARPU drop- Flat subs growth- Fierce competition

Opportunities

- New video technologies - 3G, Triple Play

Threats

- Limited market size- Competition from ISPs- Networks not owned

Opportunities

- More bandwidth- Triple Play

Telcos, Cable, Mobiles and ISPs Become Competitors

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6 4

7Triple Play Applications

The new IPTV services can be seen as the combination of television with the highly interactive of Internet concepts. The result is a number of new applications based on the delivery of audiovisual contents in a bidirectional, customized and controlled way.

con

nec

tio

n t

ime

101 105102 107103 108104 106

101

104

103

102

1 kbit/s 1 Mbit/s 100 Mbit/s

1 min

1 hour

24 hours

Interactive TV

MP3

Gaming

VoIP

VideoPhone

Data

Multichannel HDTV

Last Week TV

Internet

Enterprise Data

Surveillance

CCTV

VoD

bit rate

Datacom3 hour

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7 4

7Voice over IP

IP telephony can potentially bring benefits to subscribers, service providers and carriers:

• Subscribers benefit from lower call costs because operators can avoid paying interconnect charges.

• For carriers, IP telephony brings the ability to integrate voice and data over the same network.

• For carriers it offers new opportunities by means a new class of services that goes beyond classical telephony such as video telephony, integration of mobile and fixed telephony or telelearning.

PCMencoder

PCMdecoder

TXbuffer

RXbufferencoder

Voice Voicedecoder

Analogphone

Analogphone

PSTN switch PSTN switch

TDM trunk

Packet trunk

IPphone

IPphone

IP routerIP router

TD

M T

elep

ho

ny

IP T

elep

ho

ny

ProxiProxi

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7IP Television

IPTV is made with at least four component:

1. Video contribution, which may include television and video on MPEG demand applications. Contents is coded, formatted and streamed according the addressing scheme and the protocols to transport the signal and distribute the programs across the subscribers.

2. UDP is the most common higher-layer envelope to forward packets across the network.

3. Access network, audio an video packets reach the customer premises thought the access network which may be based on ADSL2, ADSL2+, VDSL2, FTTN, PON, or WiMax

4. Customer Premises, to reach the Set Top Box (STB) where are signals decoded and finally displayed on a TV or a PC. The Internet Group Membership Protocol (IGMP) is used for channel tuning.

Video Contribution Customer PremisesDistribution network

IP / VPLS STB

TV device

Broadcasters

Live TV

VoDEncoder

Access network

Router

PC

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7IPTV and VoD

The Video on Demand (VoD) applications are a bit different to live IPTV since it requires the establishment of a point-to-point unicast relation between the server and the subscriber to enable subscribers to select and watch an stored video interactively across the IP network.

There are two groups of VoD applications:

1. Streaming VoD, real-time service the video is downloaded directly from the server to the TV.

2. Downloading VoD, best-effort service, the file is downloaded and saved before being displayed

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47Personal Video Recording Services

Each subscriber has his own storage disk at the network, or at the subscriber site, to record programs that will be playbacked according user convenience using VCR-like functions. Implementations:

- Networked Personal Video Record, user can record TV programmes in the network-based server.

- Client Personal Video Record, user have their own PVR device at home

- Private TV, closed groups of user can create their own TV uploading their videos and programs to be downloaded by VoD or even scheduling the transmission to a their associated subscribers.

- Last week TV, the IPTV operator may offer the complete retrieval of last week programs

- Time Shift TV, subscriber of real time TV can record the program while watching it. This allows pauses, or to skip the ads section, and then go back again to some time point of the live broadcasting.

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47Triple Play Strengths and Weaknesses

Strengths Opportunities

Weaknesses Threats

- Bidirectionallity

- Network Convergence

- High Demand of TV services

- Interactive TV services

- Increase the ARPU

- Customized publicity

- Immature technology

- Premium contents required

- Complex and expensive

- Television is a mature market

- Sold as a cheap bundle

- Competitors are moving to IP

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47Strengths: Bidirectionallity

ContentsProducer

Advertiser

BroadcastTV Operator

Network Audience

ContentsProducer

Advertiser

IPTVOperator

Network Audience

TV: Unidirectional Model

IPTV: Bidirectional Model

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13

47Weaknesses / Threats

To create real demand for audiovisual services delivered over IP will not be enough bundling television with broadband access and phone services

- Immature Business, providers must discover their specific market segment.

- Quality Contents, which is fundamental to enter and to stay in such a mature market of TV.

- Complex, interaction increases the complexity of the middleware, and the user interfaces as well.

- Very Expensive, consolidating

- Competitors, will react offering lower prices, consolidating companies and improving the services

Profits High

Low

Many

Ben

efits

Few

Features

Usability

trade off area

Section

Quality of Service (QoS) Control

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47Alternatives to QoS Control

1. Over-provisioning

- Traditional solution for private and public networks

- May work for a while; requires regular updates

2. Traffic Engineering (MPLS)

- Improves routing performance and indirectly helps QoS

- Compatible with most networking technologies and protocols

3. Resource Reservation (IntServ)

- End-to-end guarantee of QoS; needs a signalling procedure (RSVP)

4. Differentiated routing (DiffServ)

- Edge routers classify packets into priority classes

12~106 kbit/sBandwidth

Loss

Delay

Jitter

1%

150 ms

30 ms

VoIP

32 ~ 320 kbit/s

2%

5 s

Jitter buffer

Streamed MP3

0.005 ~ 10 Mbit/sBandwidth

Loss

Delay

Jitter

2%

5 s

Jitter buffer

VariableBandwidth

Loss

Delay

Jitter

Sensitive

Insensitive

Insensitive

Audio Video Data

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47Integrated Services (IntServ)

Based on resource reservation using end-to-end signalling

- Applications require resource management

- Resource reservation is done per flow by means of Reservation Protocol (RSVP) signalling

- Guaranteed service and controlled load for QoS-sensitive flows

- Source-to-destination packet handling at each hop and per each flow

- It’s not very scalable: RSVP is end-to-end and too complex

- Large packet processing and resource reservation makes RSVP inappropriate for core routers

Source

PATH

RESV

Data

Data

Data

PATH

RESV

RESV Tear

RSVP

PATH

RESV

Data

Data

Data

PATH

RESV

RESV Tear

Destination

Initiation

Data transmission

Refresh

Termination

IP

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47Differentiated Services (DiffServ)

Key QoS control is managed at the Ingress router

- IP packets are marked and classified into categories or DSCP

- In charge of packet access, shaping and policing

Core routers just forward packets

- Fast routing to the next hop (rather than end-to-end management like in RSVP)

- Packet scheduling per DSCP. No previous signalling, no resource reservation

- End-to-end QoS built with PHBs

DiffServ does not guarantee a QoS but manages flows differently

- Simple and scalable solution

Ingress Router

Egress Routers

Flow identificationPacket markingAccess control

Core RoutersTraffic schedulingPer hop forwarding

Data Flows

EF

AF1

AF2

AF3

AF4

BE

+ -

EF: Expedited ForwardingAF1-4: Assured Forwarding (x4)BF1: Best Effort (lowest priority)

DiffServ Routing

In Out

Queues

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18

47Multiprotocol Label Switching

MPLS manages traffic streams by separating route selection and packet-forwarding functions.

Pseudowire Edge-to-Edge Emulation PWE3 require a Tunnel label, used for guiding the frame through the MPLS domain, and a VC label, used to identify each customer’s traffic matching an MAC, Port or VLAN tag to a constant label.

Including VPLS (the PWE3 multipoint implementation) the Metro Ethernet network can provide easily:

- QoS to support triple play services

- Increased scalability overcoming the MAC address explosion issues

- Integrated protection architectures

- Advanced management

SDH NG

MPLS domain

LER: Label Edge Router

LSR: Label Switched Router

LSP: Label Switched Path

CPE

Triple PlayDSLAM

STB

POTS/ISDN

IPTV

VoIP

Internet

VoD

PWE3: pseudowires

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47IP Network QoS control (ITU-T Y.1541)

Upper bound QoS Parameters

Class Applications Delay Jitter Loss Error

Class 0 Real-Time, Jitter Sensitive, High Interaction(VoIP, IPTV, VTC, VoD)

100 ms 50 ms 1x10-3 1x10-4

Class 1 Real-Time, Jitter Sensitive, Interactive(VoIP, IPTV, VTC, VoD)

400 ms 50 ms 1x10-3 1x10-4

Class 2 Transaction Data, Highly Interactive(Signalling)

100 ms Undefined 1x10-3 1x10-4

Class 3 Transaction Data, Interactive 400 ms Undefined 1x10-3 1x10-4

Class 4 Low Loss Only (Short Transactions, Bulk Data, Video Streaming, VoD on local disk)

1 s Undefined 1x10-3 1x10-4

Class 5 Best Effort IP Networks Undefined Undefined Undefined Undefined

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47VoIP Opinion Models (in-service test)

MOS (Mean Opinion Score): To arrive at an MOS score, a tester assembles a panel of “expert listeners” who rate the quality of speech samples that have been processed by the system under test.

- Ideally, a panel would consist of a mix of male and female listeners of various ages

- The samples should reflect a range of typical voice conversations

- Each panelist rates the quality of the system output from 1 to 5, with 1 indicating the worse and 5 the best

- The scores of the panelists are then averaged

E-Model: a computational model that uses transmission parameters (errors, packet loss, delay, echo...) to predict the subjective quality of voice. Good for conversational MOS evaluation using R-factor.

R-factor

1009490

80

70

60

50

User SatisfactionMOS

0

4.54.44.3

4.0

3.6

3.1

2.6

1

Very satisfied

Satisfied

Some users dissatisfied

Many users dissatisfied

Nearly all users dissatisfied

Not recommended

Desirable

Acceptable

Unacceptablefor toll quality

Distribution Network

VoIP Router Router VoIP

Conversational MOS evaluation (Bidirectional)

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47VoIP Delays

Rec. ITU-T G.114, unidirectional delay in ms:

- 0 - 150: acceptable for most applications

- 150 - 400: acceptable, but degrades the QoS

- > 400: unacceptable; only for voice messages or walkie-talkie gadgets

IP

Hellooo!

Encoding Buffering Ingress

Transmission

Egress Jitter buffer Decoding

Half DuplexITU Internet, Satellite

0 100 200 300 400 500 600 700 800 900

ms

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47IPTV: The Subscriber’s Point of View

Where QoS Event Where QoS Event

Head-end & Contents

- Coding distortion- Server overload- Coder impairment- Encoder impairment- Error Indication

Distribution Network

- Network contention- IP packet loss, jitter, delay- RTP packet loss, jitter- TCP Retransmissions

Transport Stream

- PCR jitter- Continuity error count- Synchronization error- Interarrival jitter- Error on PSI table- Unacceptable latency

Transaction- IGMP latency (IPTV)- RTSP latency (VoD)

AudioVideo

DataAudio

Contribution

IP Network

STB

Packet LossSync error

Packet DelayPacket Delay

Continuity error

PCR Jitter

Transport error

Packet Jitter

QoS QoE

Coding error

Pixelation

Freezing

Blurring

Distortion

Zapping Delay

Edge distortion

Router

Contribution

DistributionTransaction

CPE

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47Quality of Experience (QoE)

Quality of Experience (QoE) is intended to measure how good the service is from the customer’s point of view, rather than under the service point of view as the Quality of Service does. QoE is a subscriber centric paradigm when the IPTV service is degraded producing effect like:

- No service at all, frequent service interruptions, wrong formatting, very high latency, authentication problems to watch private programs like pay-per-view.

- Video degradation. freezing, blurring, visual noise, loss of color, edge distortion, pixelation, tiling.

- Audio degradation. Drop out, lips synchronization, voice distortion, bad signal to noise relation, echo.

- Poor Interaction. No zapping capability, loss of VoD functions like start/stop/fwd

Quality of Service Quality of Experience

Subscriber CentricService Centric

Events Count

Techno Centric

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47Verify the IPTV Service

Video rendering is important for qualitative video performance assessment.

A single lost packet in an MPEG-2 video stream is displayed as several errored pixels or even lines in

- a video frame (spacial error propagation),

- several video frames with errored pixels (temporal error propagation).

Temporal error propagation

Spatial error propagation

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47 Interarrival Packet Jitter

Interarrival Packet Jitter is filtered with he decoding buffer but. Higher rates may produce decoder buffer overflow while lower rates me cause buffer underflow.

The consequence is, in both cases, a bad quality.

Head-end STB

2.51 Mbit/s

High jitter Low jitter

Congestion

: decoding buffer

Overflow Underflow

to t2

3.7 Mbit/s 2.2 Mbit/s

Time distortions

No Jitter

Normal

t1

2.51 Mbit/s

overflowbuffer level

underflow

Max.

Min.

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47Video IGMP Delay

Multicast Router STB

Join request

Leave request

Head-ends

“Al-Jazeera news”

“CNN news”

Membership query

Processing Delay

Leave Delay

Join Delay

Buffer DelayDecode Delay

Zap Channel

Network Latency

New Channel

Leave

Join

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47Transport Stream impairments (TR 101 290)

Tests are grouped into three tables according to their importance for monitoring purposes.

1. Priority 1, This category classifies the critical elements necessary for decoding of the MPEG signal. The events can be grouped into three types:

- TS sync loss, PAT and PMT error,

- Continuity Count error, indicate loss of packets, dropped packets, out of order or packet duplications.

- PID error, occurs when the data of a referenced PID is lost for a period of time

2. Priority 2, The following elements should be kept under control to achieve the quality targets:

- CRC error, indicates corrupted data in the PSI tables.

- Timing events, indicates difficulties to recover PCR then synchronization problems are likely.

- CAT error, there is an indication to decode a private program but no CAT table has been found to unscramble it

3. Priority 3, optional category since many implementations have simplified the structure of the TS.

- Buffer error, For this indicator a number of buffers of the MPEG-2 reference decoder are checked whether they would have an underflow or an overflow.

- Unreferenced PID, Each non-private program data stream should have its PID listed in the PMTs.

- SDT error. The SDT describes the services available. Without the SDT, the STB is unable to give the viewer a list of what services are available

Section

Integrated Multimedia Test System (IMTS)

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47IPTV, VoIP & HSI Lab Solutions

The system allow the verification of network elements and their compliance capabilities of IP phones, STB, IPTV, PC and components for interconnection (wireless, coax, PLCs).

VoIPIP Television email FTPVideo on Demand InternetP2P

ALBEDO Integrated Multimedia Test System (IMTS)

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47Integrated Multimedia Test System

This Multiplay Test System includes a series of facilities, equipment and optional services to provide an optimal solution, scalable and effective safeguards need to evolve with complete ability to create new tests and trials expected in futur.

ISDNSN

InternetInternet

VoiceVoD

TV

VoIP

VPNMobile

VoD

VoIP

VPN

Tele-

AresTriple Play

phone

GamingVoIPData

HSI

P2P

IPTV DUT

Services Under Test (SUT)

FTTH

MultiplayServers

Devices Under Test (DUT)

IP Network

Integrated MultimediaTest System (IMTS)

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47Acces Network Verification

The Integrated System Test verifies network and the Multiplay services such as IPTV or VoIP particularly in the case of a failure or bad quality is not determined the cause if it is on the network or device that is being evaluated. The System is a known and 100% controlled environment. The simulation of the network and the subscriber, involves the generation of traffic, often a client / server, which is not in itself proof traffic but at the same time it is essential to ensure that evidence can function correctly.

FTTN

Splitter

DSLAM

FTTC

FTTH / FTTP

ADSL / ADSL2+ / VDSL2

Router

ADSL2+ / VDSL2

Router ONT

150m

ADSL2 / VDSL2

1500m

3000 m

Router xDSL

Router xDSL

Fibre

DSL

WiMAX

Switch

Bonding

(8 Mbit/s)

EFM(10 Mbit/s)

(24 Mbit/s)

(50 Mbit/s)

(100 Mbit/s)

Router xDSL

(20 Mbit/s)

HFC (Cable)(30 Mbit/s)

Fiber

Fibre

GPON

Coax Cable

VCG

SUT DUTs

Integrated MMedia Test System

Service EmulationIPTV, VoD, VoIP, P2P

IP NetworkANUT

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47 QoS vs. QoE

Disruptions can occur anywhere on the network and determine the quality of the network service (QoS) that affect the experienced quality (QoE).

Contribution

IP Network

STB

Packet LossSync error

Packet DelayPacket Delay

Continuity error

PCR Jitter

Transport error

Packet Jitter

QoS QoE

Coding error

Pixelation

Freezing

Blurring

Distortion

Zapping Delay

Test

Edge distortion

RouterAudioVideo

DataAudio

FAIL

PASS

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47ALBEDO Net.Storm

The diversity of underlying technologies, and the adaptive behavior of applications requires more sophisticated testing technologies. NetStorm facilitates the verification of new applications, services and nodes through emulation of the real nature of IP networks. NetStorm enables engineers to model and modify arbitrary performance dynamics including packet delay, jitter, bandwidth limitations, congestion, packet loss, errors and duplication on live IP packets.

Packet Loss

Packet Delay

Contention

Continuity error

Packet Jitter

Transport error

HDTV

Packet Duplication

VoIP

DataNet.Storm

Audio Server

Data Server

Video Server

Packet Reordering

Shaping

Bandwidth limitation

IP

(Network Emulation)

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47GPON analysis

Albedo GPON analyser can capture and analyse traffic in real time and can drop data for further analysis with other applications and instruments

OLT

ONT

Analysis of IPTV, VoIP and Data

Splitter

Internal Analysis

GPON Tester

External Analysis

Service Under Test

IPTV

VoIP

Data

Service Under Test

Triple Play Network

GPON Access Network 

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47Acceptance Test of CPE equipment

An interfering signal in the frequency band in which you want to create disturbance in the physical environment. The equipment being measured (DUT) is inserted into the suitcase of Faraday. If it were a router, as the case illustrated in Figure, first access network to the test system and on the other client computers using the appropriate physical environment Coax, UTP or PLC. In the case of WiFi transmitter and receiver must be placed inside the Faraday Box.

Disturbances Generator Faraday Box

Antenna

Service Under Test

IPTV

VoIP

Data

Device Under

Test

NetworkTriple Play

Section

Enhanced Television Monitoring Sytem (ETVMS)

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47Enhanced Television Monitoring Sytem ( ETVMS)

This ALBEDO solution is a monitoring system up to four different TV and Video technologies :

• DTT based on a SDH distribution network. The signal is converted into DVB-T interface (COFDM modulation) and delivered to the end users through transmitting antennae.

• IPTV service with IP/MPLS distribution network. IPTV services reach the end user in (either multi-cast or unicast) IP and are processed by a special STB before being displayed.

• Mobile video services supplied over a UMTS and GSM cellular networks. The monitoring points are standard Ethernet/IP (distribution network is IP/MPLS) ports signal encapsulation is 3GP.

• Analogue video (PAL) over dedicated wavelength in GPON network (video overlay). Distribution net-work is IP/MPLS and the video signal is converted into analogue in the remote HE.

Audio

Video

ES

ES

ES

PES

PES

PES

PCR/SCR

TransportMultiplex

TS IPTV

Programa k

Multiplexer

1 2

3

Encoders

MPEG

PacketizersSTB

4

Modulator

5

Data..Programa 1

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47QoS monitoring of TV signals

This solution delivers comprehensive service fulfillment, service assurance, and service optimization capabilities to RFoGPON, DTT, IPTV, and Mobile TV services. The integrated solution reduces operational expenses and increases TV service revenues by combining rich Diagnostics and Management functionality into DataMiner, a comprehensive platform that integrates seamlessly multiples technologies from different vendors, into a unified management system.

Whatever the TV technology is the goal is to identify when and where a problem is likely to occur. Monitoring equipment can be deployed at critical points in the network. Therefore a unified platform for all is required. For this reason a purely reactive approach to video quality problems is unlikely to be viable. Our goal is to provide with a solution for fault management that will improve service fulfillment, service

assurance and service optimization.

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39

47RFoGPON TV Monitoring Network

Monitoring the contribution contents for the RFoGPON.

Connection to the network requires a 10/100/1000BASE-T interface containing the signal to be monitored. This interface could be mirrored from the in service port or link aggregation group (LAG).

SDI

Encoder

IPTV probe

Cisco

Contribution

SR-MST-1

SR-MST-2

MP1

IEEE 802.3 Ethernet10/100/1000BASE-T

IPTV / VoD

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40

47Monitoring the TV / GPON at the HE

The signal is converted to analogue format in the remote HE and injected in an optical fibre. It is required to monitor de signal after being converted into analogue and before being transmitter to the optical fibre. This is accomplished with the Analogue probes. Signal is directed to the probe with the help of a coaxial T connector.

IPTV / VoDIPTV / VoD

Modulator

SR1

SR2

IPTV probe IPTV probe

3750

3750Media

converter

Analogue

MP11

MP12

MP2

Coaxial cable

Probe

PAL / NICAM / SECAM probe

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41

47Monitoring the RFoGPON network at the centra

The video signal is received in the local exchanges in an optical fibre over a dedicated wavelength (1550 nm). This probe is combined with services carried in other wavelengths and delivered to the subscriber.

MP1Combiner

Client

Combiner

Analogue

ONT

RF Video

RF

probe

Splitter

PAL / NICAM / SECAM probe

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42

47Monitoring the DTT (TDT) network

For DTT, network is fed in the Contribution site. Here, signal is either transmitted to end users (DVB-T) or distributed to RF transmitters over the country through an SDH network. In the Contribution Network there are three or four monitoring points.

Digital Video

SDI

DVB probe

Contribution

DVB probe

ASI

DVB probe

Transmission

ASI ASI ASI

DVB probe

ASI

Digital Video

SDH

Digital VideoDigital Video

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43

47DTT network SDH redundancy nodes

DTT signal is distributed to the transmission nodes through SDH redundancy nodes. Monitoring architecture for the redundancy nodes is similar to the Contribution DTT monitoring architecture. Video signals over SDH is converted to DVB ASI to enable monitoring.

DVB probe

ASI

SDH

SDH

Digital Video

DVB probe

ASI

SDH

Digital Video

DVB probe

ASI

SDH

Digital Video

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44

47DTT radio transmission and reception nodes

The transmitter has two monitoring points. One of them (ASI) checks the signal before being modulated, the second one monitors the RF signal once it has been modulated. Both monitoring points require DVB probes. For the receiver there is a single RF digital monitoring point.

SDH

DVB probe DVB probe

DVB probe

ASI RF

RF

SDHDigital Video Digital Video

Digital Video

DVB probe

RFDigital Video

DVB probe

RFDigital Video

DVB probe DVB probe

ASI RF

Digital Video Digital Video

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45

47IPTV service monitoring

Contents for the IPTV service fed the network at the the Contribution Network facilities and it is distributed through an IP/MPLS network to local exchanges. CPEs get access to the video services through the access network. Multicast and unicast IP video is multiplexed with standard IP services. Video is decoded with the help of a dedicated STB installed in the customer premises.

It is understood that monitoring of the IPTV service will be carried out from Ethernet / IP interfaces. In fact, requirements for the monitoring points are the same that for most of the IP monitoring points already described in this presentation.

IPTV probe

Switch / Router

IPTV / VoD

SDHIPSDHIP

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46

47Mobile TV Monitoring

Monitoring video services for the mobile network is carried out form standard IP/Ethernet ports. Probes will be fed by signals got from the network in the same way that for the IPTV network.

There is however an important difference between the monitoring application for the cellular network and the fixed IPTV service. For IPTV video is encapsulated in MPEG2 TS but mobile video contents has a 3GP encapsulation. Using an IPTV probeDVB probe for monitoring the mobile video requires transcoding de signal into a format it can receive.

Transcoder

IPTV probe

Switch / Router

IPTV / VoD

SDHIPSDHIP

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all

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